An onomatopoeic word for the swallowing/gulping sound (e.g. gulp). Often used as in 'to gulp (down)'.
喉が渇いていたので、水をゴクンと飲み干した。
I was thirsty, so I gulped down the water.
先生の話を聞いて、彼は緊張してゴクンと唾を飲み込んだ。
Hearing the teacher's words, he swallowed nervously with a gulp.
薬は朝食後にゴクンと一錠飲んでください。
Please take one tablet with a gulp after breakfast.
映画の怖い場面で、観客がゴクンと音を立てた。
At the scary scene in the movie, the audience made a collective gulp.